netdev - [PATCH net-next] netlink: include netnsid only when netns differs.

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Message-Id: <20170530213325.21652-1-fbl@sysclose.org>
Date:   Tue, 30 May 2017 18:33:25 -0300
From:   Flavio Leitner <fbl@...close.org>
To:     netdev@...r.kernel.org
Cc:     Flavio Leitner <fbl@...close.org>
Subject: [PATCH net-next] netlink: include netnsid only when netns differs.

Don't include netns id for notifications broadcasts when the
socket and the skb are in the same netns because it will be
an error which can't be distinguished from a peer netns failing
to allocate an id.

Signed-off-by: Flavio Leitner <fbl@...close.org>
---
 net/netlink/af_netlink.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index ee841f0..b9f1392 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1414,8 +1414,10 @@ static void do_one_broadcast(struct sock *sk,
 		p->skb2 = NULL;
 		goto out;
 	}
-	NETLINK_CB(p->skb2).nsid = peernet2id(sock_net(sk), p->net);
-	NETLINK_CB(p->skb2).nsid_is_set = true;
+	if (!net_eq(sock_net(sk), p->net)) {
+		NETLINK_CB(p->skb2).nsid = peernet2id(sock_net(sk), p->net);
+		NETLINK_CB(p->skb2).nsid_is_set = true;
+	}
 	val = netlink_broadcast_deliver(sk, p->skb2);
 	if (val < 0) {
 		netlink_overrun(sk);
-- 
2.9.4